Pug mill



Dec. 21 1926.

H. R. STRAIGHT PUG MILL Filed June 17. 1925 [wel/2507' Patented Dec. 21, 1926.

HALVER R. STRAIGHT, OF ADEL. IOVA.

PUG MILL.

Application filed June 17, 1925. serial No. 37,739.v

The object of niky invention is to provide a pug mill of simple, durable and inexpensive construction, which is especially adapted to handle large quantities of material.

A further object is to provide a pug mill, which is adapted to handle large quantities of material and to feed a number of tile machines simultaneously, having pugging mechanism which maybe adjusted to deliver the proper amount of material to each of said machines as is desired, whether one or a number of the tile machines are in Opera tion.

A further object is to provide in a pug mill improved means for supporting and mounting the muller wheels.

A further object is to provide in a pug mill means whereby the life of the muller `wheels will be greatly increased.

A further object is to provide in a pug mill an improved pan having its bottom wearing surface formed of a series of small detachable wearing members, so that the bottom of the saidv pan may be renewed as often as necessary without having to provide an entirely new pan.

My invention consists in the construction, arrangement and combination of the various parts of the device, whereby the objects contemplated are attained, as hereinafter more fully set forth, pointed out in my claims, and illustrated in the accompany-l ing drawings, in which:

Figure 1 is a segmental plan view of ymy improved pug mill,

Figure 2 is a detail sectional view taken on the line 2 2 of Figure 1,

Figure 3 is a detail sectional view taken on the line 2%*3 of Figure 2; and

Figure 1 is an end elevation of one of the bearing members. Y

My improved device comprises a base member 10 having an upright pivot l10n which is rotatively mounted the pan 12 which is provided with cylindrical sides 13 having a bottom 14', the central portion of which is provided with an upright annular wall member 15, the top edge of which is pro-V vided with a plate 1.6. Said plate 16 forms what I shall term a supply table, the een? tral portion of which is provided with a ydownwardly extending sleeve 17 designed to rest over the pivot 11.

The pan V12 is of comparatively large die ameter, the outer edges of which are supported by means of rollers 18 mountedin said pan.V

Above the supply table 1G I have provided a hopper 2O which has its lower edge a slight distance above the table 16, the lower end of said hopper being also of smaller diameter so that material may rest on the plate 16 without falling over the edges of the annular walls '15. i i

Pivotally mounted, preferably at four points adjacent to the lower edges of the hopper, I have provided brackets 21, each of which is provided ,with a scraper 22 arranged in a somewhat tangent manner with the center ofthe hopper in such a manner that as the plate 1G is rotated beneath it, material will be discharged over the top edge of the flange 15 into the annular trough between the walls 13 and 15. The bottom plate 14 is provided with a removable lining 23 which is composed preferably of paving brick 24 setk on edge, the brick being formed circular and provided with a filler 25 between them, which serves to anchor the brick and yet permit them to be yeasily removed when so desired. This filler might be some asphalt or tar composition.

The hopper 2O is provided with a number of bearing members 26 secured to its outer face, each of the bearing members being provided with a vertical opening 27 designed t'o receive a pivotpin 28. The lower end ofthe pin 28 is provided with a bearing'member 29,V said bearing member being designed to rotatively receive one end of a shaft 30, which has its outer end slightly elevated. The said shaft is larranged radially when in a normal position. The outer end of the shaft 30 is provided with a hear-Y ing member 31 supported from an upright pivot pin 32, and which is pivotally mount` ed in a slide'block 33. This slide block is mounted in parallel guide members "llgwhich are arranged tangentially with the center of the pan, the shaft being' slidably mounted in the bearing 31 in such a manner that as the block 33 is moved longitudinally of the guides 311, the shaft 30 will be moved from a radial position to a 4positionjat a considerable angleV with said radial position, the movement being about Vthe pivot 28` to a position assumed by the left hand shaft 30, as shown in Figure 1, for the purpose hereinafter made clear.

The block 32 is moved longitudinally withy the `guides by means of a screw threaded shaft 35 mounted in bearings 36 in each end of the guides. Said guides are supported by uprights 37 located adjacent to one side of the. pan l2. The block 32 is provided with a screw threaded lug 38 to travel on. the said shalt 35 by means of which movement is imparted to the said block from the said shaft. The outer end of the shaft 35 is provided with a crank 39, rl`he shaft 30 is provided witn a series of inuller wheels fl() which are arranged in pairs, each pair of wheels being secured to a hub el, said hub being rotatlvcly mounted on the shaft 3l) with the hub oi one pair of wheels resting adjacent to the hub of the next pair of wheels.

On account ot the shaft 30 being inclined relative to the floor of the pan l2, it will be seen that the inner sets of wheels will be smaller in diameter than the outer sets, the wheels of each pair being substantially the same diameter.

By arranging the wheels l0 in pairs on a single supporting hub, l have provided means whereby the peripheries of the wheels will be supported rigidly against lateral movement. lt will also be seen that by providing the said wheels in pairs and rigidly connected to the saine hub, l have provided means whereby a certain amount of dragging or slipping will result between the bottom of the pan and the engaging edges of said wheels, inasmucli as the circumference of the Wheels is substantially the same, while the length of the circular path over which they travel is varied considerably due to the tact that one of the said wheels is nearer the center of the pan than the others. By this arrangement it will be seen t iat as the material to be pugged travels beneath the said muller wheels, a dragging or tearing action will be imparted between the bottom of the pan and said wheel, which greatly assists in rapidly producing the desired mixture.

lt will further be seen that by providing smaller wheels at the inner end of the shaft, l have provided means whereby when the peripheries of the wheels have become worn excessively, l may drop the shalt 30 by simply removing the lower half of the bearings Q9 and 3l, permitting the shaft to be rolled from beneath the upper halt ot id bearings, at which time the inner pair ot wheels may be removed and the shaft moved longitudinally and outwardly through the remaining wheels, and a new pair of wheels mounted on the said outer end. l/Vhen 'the shaft has been replaced, that portion of the wheels which has been worn away will be compensated for, thus providing means whereby the wheels may be utilized for a greater length of time without having to be renewed.

By shifting the outer end of the shaft 30 to roof. ice

especially adv Yit:un-eciii-J w iig in connection with a puy' tl are a n; tile r eral from a rthe chutes or plow are shown ustratc means wl Pri l, material may be removed at a point adr v! 1., caen or the uan n out or operata 'iat it is necessary ich is easily and quickly ac( simply movirg one of the wheels to position wher with the center of said no outward movementbe caused by said wheels.

lt will 'further be seen that by the outer end of the shaft 80, the will operate in planes ghllY the vertical, and when the o, shattlr l adjustodv to an angle relative .to its radial position, the forward edge olf sai disl; will have a tendency to enter the material and impart a rollin ment to the material is moped ortwardly. This also assists moving the material. about in s that it may be bron. it into another pair of muller wheels.

,ily providing the floor with a detachable lining, which is 'formed ot cheap material such as paving brick, which is further cheapcned by the vfact that it may be made usually by the company operating the machine, l have provided ieans whereby the floor of said pan may be renewed ot'ten as desired at a very slight expense.

l claim as my invention:

l. A pug mill comprising an annular pan, a hopper for feeding material to the central portion of said pan, a radially arranged shaft having one end pivotally connected near said hopper adapted to swing in a substantially horizontal plane, and a series ot muller wheels for said shaft.

A pug mill comprising` an annular pan, a hopper for 'feeding material to the central portion of said pan, a radially arranged shaft having one end pivotally connected near said hopper adapted to swing in a substantially horizontal plane, a series of inuller wheels for said shaft, said muller wheels being arranged in groups, each group being secured rigidly to a single hub, and said hub being rotatively mounted on said shalt.

3. A pug mill comprising a horizontal l l, LACH uiLl/C ,rial will pan, a shaft extending across and above said pan, one end of said shaft being slightly above its opposite end, a series of muller Wheels rotatively mounted on said shaft, said Wheels being of' various diameters so that the inner side of their peripheries lies in a plane 'substantially parallel With the bottom of the pan.

l. A pug mill comprising a horizontal pan, a shaft extending across and above said pan, one end of said Shaft being slightly above its opposite end, a series of muller Wheels rotatively mounted on said shaft, said Wheels being of various diameters so that the inner side of their peripheries lies in a plane substantially parallel With the bottom of the pan, and means for detachably mounting said shaft relative to said pan.

5. A pug mill comprising a horizontal pan, a shaft extending across and above said pan, one end of said shaft being slightly above its opposite end, a series of muller Wheels rotatively mounted on said shaft, said Wheels being of various diameters so that the inner side of their peripheries lies in a plane substantially parallel With the bottom of the pan, and means for pivotally mounting said shaft so it Will swing at an angle relative to its transverse position of movement, said pan and said muller Wheels being movably mounted relative to each other.

6. In a pug mill comprising` an annular pan having a feed table at its centralportion, a hopper above said feed table, means for moving material from'the bottom of said hopper to said pan, a bracket secured to one side of said hopper, a bearing member pivotally mounted on a vertical axis, a shaft rotatively mounted in said bearing member, a bearing member slidably and rotatively mounted on the opposite end of said shaft, guide members, a block for pivotally supporting the last said bearing member, said block being slidably mounted on said guides, and means for moving said block.

7. In a pug mill comprising an annular pan having a feed table at its central portion, a h'opper above said feed table, means for moving material from the bottom of said hopper to said pan, a bracket secured to one side of said hopper, a bearing member pivotally mounted on a vertical axis, a shaft rotatively mounted in said bearing member, a bearing member slidably and rotatively mounted on the opposite end of said shaft, guide members, a block for pivotally supporting the last said bearing member, said block being slidably mounted on said guides, and means for actuating said block, said means comprising a screW threaded shaft having a crank on one end.

8. A pug mill comprising an annular and rotatively mounted pan, a series of shafts mounted normally in a radial position above said pan, means for pivoting the inner ends of said shafts to swing in a horizontal plane, means for mounting the outer ends of. each of said shafts, and means for independently imparting movement to each of the last saidmountings, each of said shafts being provided With a series of muller Wheels. Des Moines, Iowa,V June 2, 1925.

HALVER R. STRAIGHT. 

